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uitrit tutes strut @ffice JAMES H. BAKER, OF SARATOGA SPRINGS, NEW YORK.

Letters Patent No. 75,723, dated March 24, 1868.

IMPROVEMENT IN VARIABLE EXHAUSTS FOR NON-CONDENSING ENGINES.

TO ALL WHOM IT MAY `CONOERN:

Be it known that I, JAMES H. BAKER, of Saratoga Springs, in the county of Saratoga, and State of New York, have invented a. new and useful Improvement in Variable Exhaust; and I ilo hereby declare that the Afollowing is 'a full, clear, and enact description thereof, which will enableothers skilled in the art to make and use .the same, reference being had to the accompanying drawings forming part of this specification.

This invention co-nsists'in the arrangement'of a chamber in the smol e-staek or=chiu1ney oi' :thigh-pressure steam-engine, which chamber shallhave apertures through its upper end`for the discharge of steam; and in the device for regulating the discharge ofthe steam, having apertures through it, as will be hereinafter more fully described, the object being to control the draught of the furnace by discharging exhaust steam into the smokestack or chimney.

Figure 1 represents a vertical section ofthe arrangement through the line'xx of'fig. 2.

Figure 2 is a top view.

Similar letters of reference indicate like parts. i

A represents the chamber, which is cylindrical in shape, and of suitable length and diameter for the purpose desired. B is a pipe, whichconnects with the exhaust-pipe of the engine.. The upper end of the chamber is conical in form, as represented in the drawing. C represents pcrforations'through the end of the chamber, the arrangement of which is seen in iig. 2. D is a. disk-valve, having apertures or perforations through it, which apertures are also seen in iig. 2, in dotted lines, and which are marked E. F is a bolt,which .passes through the valve, (with a. square on the shank,) and up through the conical end of the chamberA. Gr is a lever, which is attached to the bolt, and by which the valve is operated by rods and levers, which are at all times under the control of the engineer.

It will be seen that by turning the valve, the holes C through the chauiber may b'eentirely closed, or entirely opened, or only partially opened, as may be required bythe engineer, so that the draught inay be increased or diminished whenever desired.

What I claim as new, and desire to secure by Letters Patent, is-

The arrangement of-the lever G, boltv F, disk-valve D, chamber A, and pipe Il, substantially asA herein described. v JAMES II. BAKER.

Witnesses:

GEORGE B. Slocum, R. WARINER. 

